Lacerta agilis and L. strigata from the territory of Daghestan differ distinctly from each other both by colour and by a complex of meristic scalation characters. No phenetically intermediate specimens were found in the pure and mixed populations of the two species. This suggests a lack of natural hybridization which was hypothesized in earlier investigations. The reliable reproductive isolation appears to be provided for by sharp differences in colour pattern. The data from which the hypothesis of natural hybridization was inferred allow for another interpretation.